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Peer to Peer

For all the hype about the rise of mobile payment technology -- use-your-smartphone-to-pay systems -- the reality is that it has been slow to catch on. But there is one place where it's starting to gain real traction: peer-to-peer exchanges.

Peer-to-peer lending site Prosper.com has stopped letting high-risk borrowers use its site because too many of them failed to repay their loans. The site's problem, says columnist and one-time lender Alex Salkever, is that Prosper got in the way of letting a social bond form between microborrower and microlender.

LimeWire, a peer-to-peer file sharing network that was recently found liable to recording artists for massive copyright piracy faces an additional threat to its existence: Music publishers are suing it too, alleging the same piracy.